Internal Flow Field Analysis And Structural Optimization Analysis Of The Airflow Pipe Of The Foreign Fiber Sorter

Study of negative pressure volume according to the existing 60AT4 noil fiber detection equipment nozzle when the impurity eliminating soft and serious loss of energy and dust removing device flow of hard to remove the impurities from the adsorption,structure of the system for removing the nozzle flow and dust removing device to optimize the reasonable design,the main research is as follows:1 Structural optimization scheme for nozzle and dust removal device.Nozzle structure adopts the structure of contraction and expansion,the export rate of the supersonic airflow velocity,meet the requirements of eliminating soft debris;dust removing device in order to overcome the negative pressure in the flow field resulting in hard debris adsorption in the dust remover to remove the problem,according to the principle of fluid structure in Nikuradse guide structure of the traditional dust removal device,at the same time the energy loss is small,the diversion line adopts streamlined shape in vitro.2 Dust removing device before and after the 2 nozzle before and after the optimization and optimization of fluid simulation,velocity vector diagram,velocity,pressure and turbulent kinetic energy flow through the cloud,compared before and after optimization,analysis before and after optimization scheme changes the flow field effect.The optimized nozzle than before optimization energy loss decreased significantly,with entrance pressure of 0.2Mpa to optimize the nozzle entrance pressure 0.3Mpa reached the exit velocity;the optimized pressure flow dust removing device for positive pressure,negative pressure to overcome the problem before the optimization of dust removing device,is conducive to the elimination of dust and other hard impurities.3 To build the flow field measurement platform,the flow field of the nozzle and the dust removal device before and after optimization was measured.The flow field of nozzle was measured and analyzed.First,the entrance pressure is 0.3 Mpa by sorting different fiber machine experiments,the optimal noil quantity,eliminating speed,based on fluid simulation,get the vector graph and image velocity and pressure,the optimized nozzle with entrance pressure of 0.2 Mpa to achieve the optimal elimination speed through the test platform is built on the nozzle respectively.The exit velocity and axis velocity were measured before and after optimization of nozzle exit velocity is 348.62m/s and 360.37m/s,compared with the simulation before and after optimization of export rate of 346.51m/s and 365.24m/s,the error was less than 3%,according to 70mm before and after optimization of export cotton pipeline velocity were 40.32m/s,46.25m/s,the speed error is less than 3%,the optimal culling rate,i.e.the optimization scheme is feasible.The research results show that the structure optimization of the nozzle and a dust removing device,to reject the impurities in raw material,thereby improving the quality of raw cotton.The flow field simulation and experimental verification of the optimized nozzle and dust removal device are carried out.The experimental results show that the optimization scheme is feasible.